I have tried several methods from CodeGuru, CodeProject, etc. and nothing works: Problem: My "purchased Installer" for my programs places the User Info in the registry under HKEY_LOCAL_MACHINE. MFC in CWinApp only uses HKEY_CURRENT_USER. How do I get CWinApp to change to HKEY_LOCAL_MACHINE? I get a error when I try to use the following code in MFC:
HKEY hKey;
RegOpenKeyEx(HKEY_CURRENT_
0, KEY_QUERY_VALUE, &hKey);
unsigned char buffer[_MAX_PATH];
unsigned long datatype;
unsigned long bufferlength = sizeof(buffer);
RegQueryValueEx(hKey, "Name", NULL, &datatype, buffer, &bufferlength);
HKEY hKey;
unsigned long dwDisp;
RegCreateKeyEx(HKEY_LOCAL_
0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS,
NULL, &hKey, &dwDisp);
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(Wished I had known about CRegKey)
If CRegKey doesn't work out, there is always the API functions.
The main ones to understand would be RegCreateKeyEx, RegOpenKeyEx, RegGetValue and RegSetValueEx.
In concept, you open a registry key (starting with HKEY_CURRENT_USER (or use the function RegOpenCurrentUser). To access sub keys, you first have to open them (get a handle to the subkey) with RegOpenKeyEx supplying the handle to the parent key and the name of the sub-key. Once you've drilled down to the desired key, you read/write the value with RegGetValue/ResSetValueEx.
A result of 2 is ERROR_FILE_NOT_FOUND meaning that you have misspelled or otherwise incorrectly entered the name of the subkey. The way to solve this is as I described in your other question: http:Q_24320847.html#a2414
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by: alb66Posted on 2009-04-14 at 05:36:44ID: 24137443
May be this can help you:
http://www.codeproject.com